Flatened or Flattened: How To spell?

The word Flatened is misspelled against Flattened, which is past tense of "Flatten"

Flattened has double "tt" is mispronounced as "t"
Remember double 'TT' in between the strings fla & ened which should not be misspelled with single 'T'
Wrong Spelling: fla-t-ened
Correct Spelling: fla-tt-ened
Explore spell check of Flattened to spell without errors.